added Card class

src/pyjack/card.py

@@ -0,0 +1,24 @@
+class Card:
+    """Class to represent an single card of a full deck"""
+
+    # TODO: - write tests
+
+    def __init__(self, suit: str, rank: str) -> None:
+        """Initializes the card and calculating its value"""
+        self.suit = suit
+        self.rank = rank
+
+        # determine the initial card value
+        if rank == "J" or rank == "Q" or rank == "K":
+            self.value = 10
+        elif rank == "A":
+            self.value = 11
+        else:
+            self.value = int(rank)
+
+    def __str__(self) -> str:
+        return self.rank + " of " + self.suit
+
+    def get_value(self) -> int:
+        """Returns the value of the card"""
+        return self.value